root / tags / v2_0_0_Build_2047 / applications / appgvSIG / appgvSIG / src / org / gvsig / app / project / documents / view / toolListeners / snapping / snappers / IntersectionPointSnapper.java @ 38317
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package org.gvsig.app.project.documents.view.toolListeners.snapping.snappers; |
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import java.awt.geom.Point2D; |
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import java.util.List; |
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import org.slf4j.Logger; |
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import org.slf4j.LoggerFactory; |
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import org.gvsig.fmap.geom.Geometry; |
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import org.gvsig.fmap.geom.operation.GeometryOperationException; |
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import org.gvsig.fmap.geom.operation.GeometryOperationNotSupportedException; |
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import org.gvsig.fmap.geom.primitive.Curve; |
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import org.gvsig.fmap.mapcontrol.PrimitivesDrawer; |
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import org.gvsig.fmap.mapcontrol.tools.snapping.snappers.ISnapperGeometriesVectorial; |
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import org.gvsig.fmap.mapcontrol.tools.snapping.snappers.impl.AbstractSnapper; |
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import org.gvsig.i18n.Messages; |
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/**
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* Intersection point snapper.
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*
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* @author Vicente Caballero Navarro
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*/
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public class IntersectionPointSnapper extends AbstractSnapper |
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implements ISnapperGeometriesVectorial {
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private static final Logger LOG = LoggerFactory.getLogger(IntersectionPointSnapper.class); |
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private static int maxPointsGeom = 1000; |
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private List<Geometry> geometries; |
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public Point2D getSnapPoint(Point2D point, Geometry geom, |
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double tolerance, Point2D lastPointEntered) { |
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if (!(geom instanceof Curve)){ |
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return null; |
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} |
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Point2D result = null; |
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if (geometries == null) { |
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return null; |
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} |
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for (int i = 0; i < geometries.size(); i++) { |
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Point2D r = intersects(geom, geometries.get(i), point, tolerance);
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if (r != null) { |
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result = r; |
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} |
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} |
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return result;
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} |
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private Point2D intersects(Geometry geometry1, Geometry geometry2, Point2D point, |
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double tolerance) {
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//If there is a topology error don't intersects
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if ((geometry1 == null) || (geometry2 == null)){ |
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return null; |
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} |
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//The getNumCoords is not a getNumPoints but it is a good approximation...
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if (geometry1.getGeneralPath().getNumCoords() > maxPointsGeom || geometry2.getGeneralPath().getNumCoords() > maxPointsGeom){
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return null; |
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} |
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Geometry geometry; |
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try {
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geometry = geometry1.intersection(geometry2); |
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if ((geometry != null) && (geometry.getType() == Geometry.TYPES.POINT)){ |
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return geometry.getHandlers(Geometry.SELECTHANDLER)[0].getPoint(); |
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} |
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} catch (GeometryOperationNotSupportedException e) {
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LOG.error("Is not possible to intersect these geometries", e);
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} catch (GeometryOperationException e) {
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LOG.error("Is not possible to intersect these geometries", e);
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} |
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return null; |
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} |
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public void draw(PrimitivesDrawer primitivesDrawer, Point2D pPixels) { |
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primitivesDrawer.setColor(getColor()); |
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int half = getSizePixels() / 2; |
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int x1 = (int) (pPixels.getX() - half); |
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int x2 = (int) (pPixels.getX() + half); |
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int y1 = (int) (pPixels.getY() - half); |
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int y2 = (int) (pPixels.getY() + half); |
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primitivesDrawer.drawLine(x1, y1, x2, y2); |
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primitivesDrawer.drawLine(x1, y2, x2, y1); |
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} |
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public String getToolTipText() { |
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return Messages.getText("Intersection_point"); |
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} |
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public void setGeometries(List geoms) { |
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this.geometries = geoms;
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} |
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} |